Change of Temperature and Pressure in Dry and Green Douglas-Fir and Sugi Wood During Passive Impregnation Method


  • Md Nazrul Islam
  • Keisuke Ando
  • Hidefumi Yamauchi
  • Nobuaki Hattori


Douglas-fir, passive impregnation, penetration, preservation, retention, sugi


This work investigated pressure and temperature change in green and dry Douglas-fir and sugi wood during passive impregnation treatment with copper azole type B preservative at higher concentration. Temperature and pressure sensors were used in wood for obtaining temperature and pressure change data every 10 s during the preservative treatment. Gross preservative and X-ray fluorescence spectroscopy was used to obtain retention. Penetration was measured following the standard. Although temperature rise was steeper in green Douglas-fir, pressure was higher in green sugi. However, phenomena were similar for dry lumber of both species. Preservative retention was very high (6.63 kg/m3), and in most cases, it exceeded the requirements of permanent structural components in ground contact applications. Preservative penetration was almost 100% for all samples.


Bamber RK, Burley J (1983) The wood properties of Radiata pine. Commonwealth Agricultural Bureaux, Slough, Australia.nBarnes HM, Murphy RJ (1995) Wood preservation—The classics and the new age. Forest Prod J 45(9):16-23.nEaton RA, Hale MDC (1993) Wood: Decay, pests and protection. Chapman and Hall Ltd., London, UK.nFujii T, Suzuki Y, Kuroda N (1997) Bordered pit aspiration in the wood of Cryptomeria japonica in relation to air permeability. IAWA J 18:69-76.nHattori N, Islam MN, Ando K, Yamauchi H, Kobayashi Y (2007) Penetration of liquid into laser incised lumber by the passive impregnation. Pages 23-31 in Proc of the 18th International Wood Machining Seminar, vol. 1, 7-9 May 2007, Vancouver, Canada.nIslam MN, Ando K, Yamauchi H, Hattori N (2009) Effects of species and moisture content on penetration of liquid in laser incised lumber by the passive impregnation method. Holz Roh Werkst 67(2):129-133.nIslam MN, Ando K, Yamauchi H, Kobayashi Y, Hattori N (2007) Passive impregnation of liquid in impermeable lumber incised by laser. J Wood Sci 53(5):436-441.nIslam MN, Ando K, Yamauchi H, Kobayashi Y, Hattori N (2008) Comparative study between full cell and passive impregnation method of wood preservation for laser incised Douglas-fir lumber. Wood Sci Technol 42(4):343-350.nKumar S, Morrell JJ (1989) Moisture content of western hemlock: Influence on treatability with chromated copper arsenate Type C. Holzforschung 43:279-280.nLebow ST (2004) Alternatives to chromated copper arsenate for residential construction. Res Pap FPL-RP-618. USDA For Serv Forest Prod Lab, Madison, WI. 9 pp.nMacLean JD (1941) Thermal conductivity of wood. Transactions American Society of Heating and Ventilating Engineers 47:323-354.nMatsumura J, Tsutsumi J, Oda K (1994) Relationships of bordered pit aspiration to longitudinal gas permeability in a given stem level: Preliminary discussion on airdried wood of Cryptomeria japonica and Larix leptolepis. Bulletin Kyushu University of Forestry 71:35-46.nPhillips EWJ (1993) Movement of the pit membrane in coniferous woods, with special reference to preservative treatment. Forestry 7:109-120.nPott GT, Hueting D, van Deursen J (2000) A commercially attractive method to reduce moisture sensitivity of lignocellulose fibres, without the use of chemicals. Pages 1-7 in Proc 3rd International Symposium—Bioresource Hemp and Other Fiber Crops, 13-16 September 2000, Wolfsburg, Germany.nRhatigan RG, Morrell JJ (2003) Use of through-boring to improve CCA or ACZA treatment of refractory Douglas-fir and grand fir. Forest Prod J 53(6):33-35.nRowell RM, Lichtenberg RS, Larsson P (1993) Stability of acetylated wood to environmental changes. Wood Fiber Sci 25(4):359-364.nRowell RM, Tillman AM, Simonson R (1986) A simplified procedure for the acetylation of hardwood and softwood flakes for flakeboard production. J Wood Chem Technol 6(3):427-448.nRuyter HP, Hortulanus A (1995) Process for upgrading low quality wood. Patent 5451361.nSimpson WT (1993) Specific gravity, moisture content, and density relationship for wood. Gen Tech Rep FPL-GTR-76. USDA For Serv Forest Prod Lab, Madison, WI. 2 pp.nSkaar C (1984) Wood-water relationships. Pages 143-144 in RM Rowel, ed. The chemistry of solid wood, (l), Advances in Chemistry Series 207. American Chemical Society, Washington, DC.nSuttie ED (1997) Novel wood preservatives. Chem Ind 18:720-724.n






Research Contributions